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WO1998036320A1 - Dispositif pour representer des images statiques et animees a l'aide d'un ecran, ecran approprie et procede de representation et de production - Google Patents

Dispositif pour representer des images statiques et animees a l'aide d'un ecran, ecran approprie et procede de representation et de production Download PDF

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Publication number
WO1998036320A1
WO1998036320A1 PCT/EP1998/000664 EP9800664W WO9836320A1 WO 1998036320 A1 WO1998036320 A1 WO 1998036320A1 EP 9800664 W EP9800664 W EP 9800664W WO 9836320 A1 WO9836320 A1 WO 9836320A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen according
screen
pigments
produced
coating
Prior art date
Application number
PCT/EP1998/000664
Other languages
German (de)
English (en)
Inventor
Claus-Peter Klages
Michael Vergöhl
Andreas Weber
Albert Engelhardt
Original Assignee
Ldt Gmbh & Co. Laser-Display-Technologie Kg
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ldt Gmbh & Co. Laser-Display-Technologie Kg, Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Ldt Gmbh & Co. Laser-Display-Technologie Kg
Priority to AU66209/98A priority Critical patent/AU6620998A/en
Publication of WO1998036320A1 publication Critical patent/WO1998036320A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/567—Projection screens for colour projection
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/16—Signs formed of or incorporating reflecting elements or surfaces, e.g. warning signs having triangular or other geometrical shape
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects

Definitions

  • the invention relates to a device for displaying static or moving images using a screen, the screen for use with such a device, a method for displaying static or moving images using the screen or the device, and a method for producing the screen.
  • Devices for displaying static or moving images using a screen are known, for example, as slide projectors or film projectors.
  • the reflection of disturbing light should be as low as possible.
  • the invention is based on the finding that projection or image walls are desirable for a planar projection of colored images with monochromatic light, such as can be generated by lasers (laser television, film projection with laser light sources), which show a strongly wavelength-selective reflection behavior.
  • Projection in the sense of DIN 190 45 Part 4 means that the viewer is on the same side of the screen or screen as the projector.
  • the reflection should therefore not be low in the range of the wavelengths which correspond to the radiation from the monochromatic light sources, for example the laser light sources used, which emit red, green and blue radiation, for example. At these wavelengths, the reflection should generally be as high as possible. For blue light the wavelengths are around 430 to 460 nm, for green light around 510 to 540 nm and for red light around 620 to 630 nm. Such a selective reflection should be used for a radiation angle 8 2 (defined in DIN
  • the invention has for its object to provide a device for displaying static or moving images using a screen, the screen itself, a method for displaying static or moving images using the screen and a method for producing the screen, the static or moving images on the screen should be clearly and undisturbed by daylight or other ambient light or disturbing light even in daylight.
  • a device according to the preamble of claim 1 in that the device has one or more monochromatic laser light sources, that a projection by the laser light from the laser light sources is provided on the screen, and that the screen is spectrally selectively reflective, whereby it unaffected by stray light, a wavelength deviating from the wavelengths of the monochromatic laser light appears essentially dark and the monochromatic laser is not strongly reflected.
  • the object is achieved by a screen for use in such a device in that the screen is spectrally selectively reflective and has a contrast which exceeds a predeterminable or predetermined limit value in the range of the wavelengths ⁇ oi of monochromatic laser light, the contrast K ( ⁇ 0 ⁇ ) is the ratio of the mean spatially integrated reflection R ( ⁇ 0 ⁇ ) to the Y standard color value.
  • the object is achieved by a method for displaying static or moving images using a screen or the above-mentioned device in that the images by scanning the screen surface with one or more time-modulated laser beams or by spatial modulation of one or more expanded laser beams, in particular by an LCD matrix, or in the manner of a projection of an image provided on a translucent carrier material using the light of one or more expanded laser beams.
  • a carrier material with an image can, for example, be a slide or a film of one Daylight projector.
  • the object is achieved by a method for producing such a projection screen in that an essentially flat substrate or a substrate provided with a topography is either transparent to all wavelengths of visible light or is provided with a light-absorbing coating, and in that a multilayer system is applied directly to the substrate or applied indirectly. Further developments of the invention are defined in the respective subclaims.
  • Reflection as a function of the radiation angle 8 2 has an angle characteristic that can be selected within certain predetermined limits.
  • a surface of an image wall, in particular a substrate is preferably initially highly absorbent, ideally colored black.
  • the reflectivity at the wavelengths of the electromagnetic spectrum, which are emitted by the laser light or by the laser light sources, is then increased using a multilayer system with several, preferably transparent layers, which are applied to the highly absorbent substrate.
  • the multilayer system can be applied directly to the absorbent or transparent substrate.
  • the additional Layer system be part of a pigment, which is applied to the substrate, for example in a transparent lacquer layer.
  • a known projection or image wall see also DIN 50 32.
  • static and moving images can be displayed on the screen in such a way that the observer can perceive these images even in daylight.
  • the screen appears black to the viewer's eye under normal daylight, but does not provide the same reflection for the monochromatic laser as a white screen.
  • a spatially integrated reflection for the RGB light of at least 50% in each case and a reflection of a maximum of 40% averaged over the visible spectral range are particularly preferably selected.
  • the screen can particularly preferably be coated with an effect lacquer which contains pigments, in particular platelet-shaped pigments, embedded in a transparent organic matrix.
  • the pigments are provided with interference layers in such a way that they strongly reflect in one or more of the RGB wavelength ranges and only weakly reflect in the other wavelength ranges.
  • the painting process is preferably selected such that the pigments in the paint layer have a defined angular distribution of their surface normals around the perpendicular to the screen.
  • the angular distribution can be (rotationally) symmetrical or asymmetrical.
  • the entirety of the pigments embedded in the lacquer layer on the screen can thereby selectively reflect light emitted by the lasers.
  • the pigments are preferably of low brightness.
  • Pigments suitable for this use according to the invention have, for example, a transparent carrier material, in particular glass platelets or mica platelets, and a multilayer system applied on one or both sides. This can consist of at least two transparent layer materials with different refractive index. These two layer materials are then preferably applied alternately to the carrier material.
  • the desired selective reflection for, for example, red, green or blue light can, depending on the type of layer system, optionally by a single RGB pigment, by a mixture of two pigments (RG + B or R + GB or RB + G) or by one Mixture of three pigments (red and green and blue) can be met.
  • the pigments which consist of a carrier material with a suitable multilayer system attached to it, can preferably be obtained by depositing inorganic materials, for example oxides, from liquids or by chemical or physical vapor deposition. Wet chemical and gas phase deposition are preferred for the production of effect pigments.
  • a physical vapor deposition PVD method, physical vapor deposition method
  • PVD method physical vapor deposition method
  • the physical vapor phase deposition allows the deposition of very dense, stable layers with good reproducibility.
  • a sputter process adapted for the coating of bulk material can be used particularly preferably.
  • a suitable interference pigment without a carrier substrate exclusively by means of a PVD process
  • a suitable layer sequence first being applied to a strip-shaped substrate, for example, and then detached and comminuted from the substrate.
  • a method is used, for example, by Flex Products.
  • a selectively reflection-enhancing pigment which is applied to a strongly absorbent or transparent substrate in a transparent lacquer layer a correspondingly prefabricated surface or a corresponding substrate can also be provided directly with a suitable multilayer system.
  • the substrate is first blackened, for example by means of an appropriately selected lacquer.
  • the blackened substrate can itself be subjected to a coating process, a layer system having the desired optical properties being applied to the blackened substrate.
  • a vapor deposition process or a sputtering process can preferably be provided as the coating process.
  • the substrate is preferably essentially flat and particularly preferably a textile web impregnated with plastic.
  • the surface of the essentially flat substrate is preferably provided with a defined roughness or surface topography before the multilayer system is applied. This advantageously avoids an unpleasant reflecting reflection for the viewer and also ensures that reflection occurs in a defined radiation angle range.
  • a defined roughness or topography can be generated, for example, by using a suitable textile material or by an embossing process in the laminated plastic layer or by using a lacquer suitably filled with solid particles, or alternatively by a combination of the methods mentioned.
  • this can also be designed as a transparent substrate.
  • the desired suppression of stray light reflection from the substrate is also achieved here.
  • a projection on transparent glass or plastic surfaces, in particular on window panes or the like, can thereby also take place particularly advantageously.
  • the screen can thereby be, for example, a head-up display in an aircraft or a simulator.
  • FIG. 1 shows a schematic diagram of an image wall according to the invention to illustrate the selective reflection for red, green and blue light
  • FIG. 2 shows a schematic diagram of the implementation of an image wall according to the invention with a transparent lacquer layer containing interference pigments against a dark background
  • FIG. 3 shows a reflection spectrum of an embodiment of an image wall according to the invention with six periods each of a high-index and a low-index layer
  • FIG. 4 shows a reflection spectrum of an image wall corresponding to the spectrum according to FIG. 3 when using anatase instead of titanium dioxide,
  • FIG. 5 shows a reflection spectrum of an image wall according to the invention consisting of nine layers of alternating high-refractive and low-refractive layers and
  • FIG. 6 shows a reflection spectrum of an image wall according to the invention, in which an overlay of three individual pigments is provided in a lacquer layer.
  • FIG. 1 shows a basic sketch of a section of an image wall 1 designed according to the invention, onto which light rays strike.
  • Radiation with wavelengths that do not exactly correspond to that of red, green or blue is not detected in accordance with the desired spectral course of the reflection.
  • a reflection only takes place for the laser light with the RGB wavelengths.
  • the portion of the white background light that corresponds to these wavelengths is also reflected by the screen. by virtue of Due to the small half-width of these reflection peaks (compare also FIGS. 3 to 6), the resulting impression of brightness is so small that the screen appears dark to the viewer's eye when the laser light is switched off.
  • Figure 2 provides a possible embodiment of the screen 1.
  • the blackened substrate 40 is provided with a transparent lacquer layer 30, in which interference pigments 50 are embedded.
  • a selective reflection is again indicated by the individual arrows, the uppermost red light beam 12 not being reflected, but instead passing through the interference pigment 50 and being absorbed by the dark substrate 40.
  • Only the green light beam 11 and the blue light beam 13 are reflected on the respective interference pigments 50.
  • the angle distribution of the reflection results from the arrangement or the arrangement angle of the respective pigments 50.
  • Such a coated pigment 51 is shown in an enlarged representation in the lower right corner of the picture.
  • the substrate 52 can be, for example, SiO, in particular with a thickness of 200 nm to 1 ⁇ m.
  • a multi-layer system on the carrier material in the form of the substrate 52 (represented here by the three layers 53, 54, 55), a selective reflector is created, which is comparable to the functions of a laser mirror.
  • the carrier material can be coated wet-chemically by means of an aqueous solution or by deposition from the gas phase by means of a chemical method, in particular the CVD method (chemical vapor deposition method) or a physical method, in particular the PVD method (physical vapor deposition). Procedure). Pigments of this type are produced, for example, by Merck as from an aqueous solution and are offered by BASF as obtained by chemical deposition (CVD process).
  • the peculiarity of pearlescent pigments is that a coherent reflection is provided.
  • the electrical field strengths are added to the visible total light.
  • the interference on thin layers is ultimately a light division. An indication of this is that the color complementing the reflection is visible in the view.
  • another feature of interference on thin layers is that the colors change depending on the angle of incidence of the light.
  • mica is provided with a metal oxide film. Titanium oxide, for example, is used here as the first metal oxide.
  • a crystal lattice of titanium oxide is that of the substance called anatase.
  • the modification of the rutile can be produced by adding small amounts of tin oxide.
  • the interference stack is preferably a constituent of a pigment which is applied directly to a corresponding substrate as the basis of the A low-index layer 63 and a high-index layer 64 are alternately arranged on the substrate 62.
  • the refractive indices of the high-index and low-index layers 64, 63 correspond here to those of titanium dioxide in the rutile phase and silicon dioxide. In this embodiment, six periods are from one high-index and one low-index layer 64, 63.
  • the high-index layer each has, for example, a layer thickness of 496 nm
  • the low-index layer has a layer thickness of 217 nm lexion due to the different, layered high and low refractive index layers
  • the brightness L * (L * , a * and b * were calculated according to DIN 5302 for D 65 lighting) to a value of 67 (the standard value of a Lambert Spotlight with constant reflectivity of 100% is 100)
  • the Y standard color value is reduced from the standard value 100 to 37.6.
  • the contrast K defined as the ratio of RGB reflectivity to Y standard color value for the projection, increases accordingly by a factor of 2.7, an image wall with a spectrally constant reflectivity having a contrast of 1.0.
  • the interference stack can also be a layer system which is applied directly to a suitable substrate as the basis of the screen.
  • the lowermost layer 62 can consist, for example, of mica or silicon dioxide or another substrate. This layer is not included in the calculation, whereby the substrate is considered a semi-infinite medium.
  • FIG. 4 examines a further embodiment of an image wall 1 according to the invention, in which the highly refractive titanium dioxide layer is present in the anatase phase. All other conditions correspond to those described in FIG. 3.
  • the individual peaks become narrower and at the same time the amplitudes are smaller compared to the spectrum according to FIG. 3. Since the layer system 64 shown here has a lower brightness L * or a lower standard color value Y than that Layer system 64 according to FIG. 3, but the RGB reflectivity is only slightly lowered, the contrast enhancement is additionally increased. On average, the contrast in the embodiment according to FIG. 4 is increased by a factor of 5.3.
  • FIG. 5 shows a further reflection spectrum of an alternative embodiment of an image wall 1 according to the invention.
  • nine different layers 71-79 are provided.
  • the individual layer thicknesses are not periodically provided.
  • the lowermost high-index layer 71 has a layer thickness of 260 nm
  • the low-index layer 72 provided above has a layer thickness of 420 nm
  • the high-index layer 73 provided above has a layer thickness of 380 nm
  • the low-index layer 74 provided above has a layer thickness of 100 nm
  • the above the high-index layer 75 provided has a layer thickness of 600 nm
  • the low-index layer 76 provided above it has a layer thickness of 100 nm
  • the high-index layer 77 provided above it has a layer thickness of 380 nm
  • the low-index layer 78 provided above it has a layer thickness of 420 nm
  • the top one provided high refractive index layer 79 a layer thickness of 260 nm
  • the brightness L * is
  • FIG. 6 shows the reflection spectrum of a further embodiment of an image wall 1 according to the invention.
  • Three different types of pigments 80, 90, 100 are incorporated in one layer of lacquer. Each of these pigments has its own coating and reflects only a single, narrowly defined wavelength range. For example, 16 periods of a low-refractive layer 82, 92, 102 and a high-refractive layer 83, 93, 103 are applied to a carrier 81, 91, 101.
  • a system Si ⁇ -X is used as the material.
  • the contrast increases by a factor of 5.
  • the layer thicknesses around the nitride concentrations can be selected differently.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Optical Filters (AREA)

Abstract

L'invention concerne un dispositif permettant de représenter des images statiques ou animées à l'aide d'un écran, ledit dispositif comportant une ou plusieurs sources de lumière laser monochromatique. Il est prévu une projection sur l'écran par la lumière laser des sources de lumière laser. L'écran effectue une réflexion à spectre sélectif et présente un aspect essentiellement foncé, sans être influencé par la lumière parasite d'une longueur d'ondes s'écartant des longueurs d'ondes de la lumière laser monochromatique et réfléchit fortement la lumière laser monochromatique.
PCT/EP1998/000664 1997-02-12 1998-02-06 Dispositif pour representer des images statiques et animees a l'aide d'un ecran, ecran approprie et procede de representation et de production WO1998036320A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU66209/98A AU6620998A (en) 1997-02-12 1998-02-06 Device for representing static and moving images using a screen, screen and representation and production method

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19705213.4 1997-02-12
DE19705213 1997-02-12
DE19747597.3 1997-10-28
DE1997147597 DE19747597B4 (de) 1997-02-12 1997-10-28 Vorrichtung zur Darstellung statischer und bewegter Bilder unter Verwendung einer Bildwand, Bildwand sowie Verfahren zur Darstellung und zur Herstellung

Publications (1)

Publication Number Publication Date
WO1998036320A1 true WO1998036320A1 (fr) 1998-08-20

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AU (1) AU6620998A (fr)
DE (1) DE19747597B4 (fr)
WO (1) WO1998036320A1 (fr)

Cited By (7)

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DE19904372C2 (de) * 1999-02-03 2002-08-01 Schneider Laser Technologies Bilddarstellungssystem
US6847483B2 (en) 2001-12-21 2005-01-25 Bose Corporation Selective reflecting
US6961175B2 (en) 2001-12-13 2005-11-01 Sony Corporation Screen, its manufacturing method and image display system
CN100430826C (zh) * 2002-03-14 2008-11-05 索尼公司 投影屏幕
US7515336B2 (en) 2001-12-21 2009-04-07 Bose Corporation Selective reflecting
US7517091B2 (en) 2005-05-12 2009-04-14 Bose Corporation Color gamut improvement in presence of ambient light
US7520624B2 (en) 2001-12-21 2009-04-21 Bose Corporation Light enhancing

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DE59912324D1 (de) * 1998-12-29 2005-09-01 Harman Becker Automotive Sys Bildwiedergabeanordnung mit Projektionsfläche für Durchlichtprojektion und Schallabstrahlung
DE19901970C2 (de) * 1999-01-20 2001-08-02 Fraunhofer Ges Forschung Spektral selektiv reflektierende Bildwand
DE10163965B4 (de) * 2001-08-29 2004-09-16 Bte Bedampfungstechnik Gmbh Lichtsperrende Beschichtung für Projektionszwecke sowie Verfahren zu deren Herstellung
US7106516B2 (en) 2002-02-04 2006-09-12 Applied Films Gmbh & Co. Kg Material with spectrally selective reflection
DE10245881A1 (de) * 2002-09-30 2004-04-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Kontrasterhöhende Bildwand
WO2004109390A1 (fr) * 2003-06-06 2004-12-16 Matsushita Electric Industrial Co., Ltd. Projecteur a laser
JP4590847B2 (ja) * 2003-09-05 2010-12-01 ソニー株式会社 スクリーン及びその製造方法
DE10357047A1 (de) * 2003-12-04 2005-07-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zum Anzeigen von Informationen auf einem transparenten Substrat
JP4274147B2 (ja) 2004-06-18 2009-06-03 ソニー株式会社 光学多層膜及び反射型スクリーン
DE102004042648A1 (de) * 2004-09-03 2006-03-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Bildwand und Verfahren zur Reduzierung von Speckle-Interferrenzen
ATE539371T1 (de) 2004-08-04 2012-01-15 Fraunhofer Ges Forschung Vorrichtung und verfahren zur darstellung statischer oder bewegter bilder
US7248406B2 (en) * 2004-10-15 2007-07-24 Hewlett-Packard Development Company, L.P. Projection screen
US8081368B2 (en) 2007-03-29 2011-12-20 Bose Corporation Selective absorbing
US7710645B2 (en) 2007-06-29 2010-05-04 Bose Corporation Selective reflecting for laser projector

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Cited By (12)

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Publication number Priority date Publication date Assignee Title
DE19904372C2 (de) * 1999-02-03 2002-08-01 Schneider Laser Technologies Bilddarstellungssystem
US6428169B1 (en) 1999-02-03 2002-08-06 Christhard Deter Image representation system
US6961175B2 (en) 2001-12-13 2005-11-01 Sony Corporation Screen, its manufacturing method and image display system
US7035008B2 (en) 2001-12-13 2006-04-25 Sony Corporation Screen, its manufacturing method and image display system
US7242523B2 (en) 2001-12-13 2007-07-10 Sony Corporation Screen, its manufacturing method and image display system
US7345818B2 (en) 2001-12-13 2008-03-18 Sony Corporation Screen, its manufacturing method and image display system
US6847483B2 (en) 2001-12-21 2005-01-25 Bose Corporation Selective reflecting
US7515336B2 (en) 2001-12-21 2009-04-07 Bose Corporation Selective reflecting
US7520624B2 (en) 2001-12-21 2009-04-21 Bose Corporation Light enhancing
US7535636B2 (en) 2001-12-21 2009-05-19 Bose Corporation Selective reflecting
CN100430826C (zh) * 2002-03-14 2008-11-05 索尼公司 投影屏幕
US7517091B2 (en) 2005-05-12 2009-04-14 Bose Corporation Color gamut improvement in presence of ambient light

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AU6620998A (en) 1998-09-08
DE19747597A1 (de) 1998-08-20

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